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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12f8c731e51132dca1f7eaaf6ba92b46e80e835ff6e9e6ae95eb175cce2af9bc' 
  AND token = 'oVbj6SuEab3uG8cHazaYo/O51q3HLTfhG1jv7LTS6Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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