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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '609e68fe7065ddf20127f88e0231d209d0bcabd2f099f4e002dd8e37dc991e74' 
  AND token = 'kyd8Qz4xulqkMa9MrQACLT6XK+bPLI2inTzf+zGbn/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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