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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47b5774a4d047b0550b31ec5683833d5b26445b7f2b404f1bd8a67230e762b7b' 
  AND token = 'SFp2q6SrCjlkmJQmtNUhUwZhfA4y4CtyrIcdU7KoaTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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