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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bae1a8b9c520e83b5846da8d0cc6b8b1c60bcb35025c72e0badd260cb90670c' 
  AND token = 'NantDqp8Elc+DIKgitPMNg92RqIHBF9ja3Lza2UX0yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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