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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b73424c04be6907e0a87b2439beea2276e27dcd5d86d8742ab87f1e02cca30b' 
  AND token = '6s5EkdBAoybuOEwR9G+2KFtrU01Ubpa4aobwgRNtjnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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