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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7a4ce29fddf465f8a3d1bf6f40200db685138631f557b3ede80166d9215257f' 
  AND token = 'Ejfv0+8nv7bG+4lz+i6k4k4sm0igGwPRYk+gzbCOank=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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