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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0035fd2be310dd50beabd3e062bf5b47df5f73e89fbb1cafec896cf7e5bf963' 
  AND token = 'O9po5zmGF/Qnxe1kIdW77sfi0ghwVpq9SNJaSRojIi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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