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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ced0456be9b00199b2f07b73a57b1da7ff511292ed06db39b0177c9f7e57d881' 
  AND token = 'ipOvOjYtdz/FNOy7a9DX+VAjknAN3Nj95jK0F6qaYU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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