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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a08186f4c4fb884659e541a4304db8473fb08634915e7a59ec58fb9713ec2f2' 
  AND token = '6AMSSO1wmO9JPccd3H/OJjyJV2yeRBicbNt6fBdaNB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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