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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b7799590d1ca4b2ea574c54dd0121a264eb720dcc43456c3029709b144aa870' 
  AND token = 'Y+f5nVUSw+H0kJxbU2bryUF1ANHoyNv12CyfkTFu5H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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