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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcc95f035d73284c1123e68497f71a34f563f87929b51a3a9840f91117f5928c' 
  AND token = 'B61Jfms7GrgkMGkuuSadx8kH/F5KGLLYG19Dd7eyUJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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