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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4190bad1060dc6f94fa1b2047e8e837b3aec963981740291db14b56332c2ccfe' 
  AND token = 'P0xjUcUcGOwlfNc4Pe+uw4CUDYXskE2dsGAF/IBr6wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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