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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53aec6cf7c283f88022fe3a3fa3c775d840c3b524e4e5fcb58d20aee31f7357e' 
  AND token = 'SKQ2vrIvsbMHnm9b7Hay4dSkNMZ53tjcQaO/otV80NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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