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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '579b5e0ea0667c38a1d323ccead2d9429152daf362491b2e76cb7ff5adffe553' 
  AND token = 'ejILPkx9vbUCIsUwUMMzGKmvpU61o5eH0Za1EV0x9Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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