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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0051fa095338056ee5406673e39df986c2864e40d3e5f774ec3693f19bdf7003' 
  AND token = 'HKvMPBqrCP1057aL0683FpIpaW5R8VHZKqSArW5XL1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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