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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a6d77e5bab6a19a7eb1db60d10c883dd0b9159c762e603c77f19ede3e4b44a0' 
  AND token = 'JoPSz4rVns2GaM8wnHhBwro7CTJxIXAOJ3UgoQN2cnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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