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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d1a003ae4e1c7aaf8c5ffb88197e39973988e7bdabffd374ccb1e591aec7e1c' 
  AND token = '+Nf5jvuQu44TzejA3Usz6UPH7M6SaAV7NvBrRxosA60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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