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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '913e818bc1cdfbe9b2ded02bc6a4d58093ae711afd53f4b6b9baefea223ca4b1' 
  AND token = '+dxG/uuwQekqO0Xtapxpq41NCkEA9Y10Q7JbL/oZhbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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