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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e46e208d74d91b55141bb889441361d12e5d749f09f865ac0cdd310051ca4ab' 
  AND token = '+7z2TXOeayNcy/+OoTm56tK0bVbK6H42mvZXXTFzi8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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