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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00d13f251f0e43a51b7490f926301c83f04f7ee63e90b3eee68e58eb06043fc2' 
  AND token = 'z23hi8bmChL2oaw2omu/G6358meTQf2TxfTrrNo9SUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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