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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '972234f3c798d647a29250155729fd4537cac32c31239956a315a2f45f99f1b9' 
  AND token = 'yZ5wS5v4bx0GbYxP4pkFBf6WibvK42kqveE4xtuBj4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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