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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc8a8ef9ce2c2a64fc4d4eeeb96bc79637bf715bf6e3966f538c78276a7fc8f2' 
  AND token = 'pl2VSYO/0bkX9gpQM/MD7pndoQYjHRdX/TbYH3oc/Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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