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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91d0490f3e7838cdaa5b9ca8c95c7ec908ce3572734dd36660e4699f84c83071' 
  AND token = 'E0/ZA6RTAaQ0pKIrxRxw796uXoyG+xAbws5S4AKuZ6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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