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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b7b089789a4c0e0d20f213f03fbaee379a7da8e57c2d602f8c116b3b608e750' 
  AND token = 'oara8vyeEnFQ0UZ1rS4TRKvwO7WNtPFBMiVr/9Hb3D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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