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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '965858c5e69dfafe8d02634f9e56b287d7fabcaecfa2cfa43abe178d96191fda' 
  AND token = 'k3U6Q15AKJQRyGTG8VAL7zZrTc4nx0xJeUSIQ/3bxKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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