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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12b555bf94c40e31dfefd5aa80cea55578b17625ced6cba8ed5efd9848d03547' 
  AND token = 'ueNkUD55441dlxNxbEsyUDfqwt+6dl85yH+K4IjIUws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}