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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba63c08b3664e6ead86e8a59ab86730ede1d0e7dbd2a29ab0fca16a48eb1ed7a' 
  AND token = '9mOCL1Xv7FQX9/pBvGnPKYsmEXYesLbXL7OwrUqf0XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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