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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc1c28fac886f5cb9817e40d607304cf1c5166b4c29ff01cec8ae7760bf91507' 
  AND token = '0iOIlBcACfm/18KrLfq9q5WVAVRpFswjGuMFHRP8ZdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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