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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe58d77b00a6de6a1ae53115904afe4125716e44262772cc3d874c5feb903b13' 
  AND token = 't7iNEvnx/Wx2YslrwcQEXi5H5OyWpWP8K3ALKr6kXFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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