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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0516004cc2f2cac40751f7860d05534f44eebaefbde685171b1dd4384857210' 
  AND token = 'm4lQof/h/vwffwflR9mCBCuT1GwvXZG4snHfuGEnDGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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