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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8392a605d67f20473f71bacbfd4e3a36dc9d0f8635fa1e4a04cd3a834a9a93d1' 
  AND token = 'b9publ8lpLYgEWWjNqJlcfw9WNmrqISUCg6jzF+f5MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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