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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '899a5b05be4aa0e7a8b1f93cef1f0de5d2d0392aee157641b153e6a4f8af2a09' 
  AND token = 'dknlKasJFkHv6shwU3wuC2RKjmIXOnQAA9Lo8IP9McY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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