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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b857509fbd4990c4257abfd83a50dbbb0655fbb9dc44a5eca2be62fafeb94f4' 
  AND token = 'B5hPtg8B0vL3RnKUeKnIuFgn+um+LTzrB6NLhP3PhtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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