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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3100f79a4b3429d29482af1fad0c140a3a8e51490b66649213d9b56fa3f204bd' 
  AND token = 'YDPLO2+BKIOfN3WVp1HW4VnCfy+Bi/SL/LAOkc2nuNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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