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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c670f0111af2ca80934bf7a46e168de9670a3eb48bf62371b5b3c6201d608f0' 
  AND token = 'jqUHc0vUdWeH+yUa3fj53VqGhTY9FC06LyX1oWWB4c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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