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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e62d3c345d01344f93d14c27ccb357046acdf4d9a38870bbad770e6d076d031' 
  AND token = 'cea6/F1ts3cX49hvmKt4nFCq9zF4ZLMvl5/13JJA5vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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