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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c59a55247509f1dc3bfb061d41bbefb98b3a89921b2c2850b19198e67bb7973' 
  AND token = 'obcA07It/zkIOJuMbHYwFpBJpOJt99PxSxj2tlkI8NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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