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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c28c2e88469ab3035a18a313a186da261d952000348df69860437b5983ea055d' 
  AND token = '0Lm6whdSBn7gt9xfCL39rbSkjxbaFa7/quFNBKb7+oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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