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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0dd0cb0cde2f0acb65195790328fdd3a39861025307a0d794597b607160c557' 
  AND token = 'UB1KaOV1ewar7b/oznmUYQjXt6mwhI237bwA36rBj3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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