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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dedb2813ef4630199848e7fbc0a8b84dd51ec29e0f5f4bf664bad7b2225b07c7' 
  AND token = 'avkJQ33FYryK40ccnnPfsT9vGTuVQNVZRskNx9KKSPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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