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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '693be011bb1402b37e67d4addbd0db8d97df8eb375b90b81978ce3145bde93c5' 
  AND token = 'fKzSV0ZkNPRdS2woESBZWnkw9QDCTUSyakZrAuI/aNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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