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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee267f1ee83b23eee15c09fb7c0a6d36890f1f41cae2093d74d939bf3b0123c9' 
  AND token = 'XLP/c9twwRaNmGiTIf2CY6FAedGcfcOQ+JaKN4Z0Eqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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