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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcaa3c633ff7d1451c04efac32e530de06dacde98ff6a29640575bba1715a7e0' 
  AND token = 'nn5nZhz0I7ICthP4JC2RpLo1NNWc/Uo45n6TjsII6YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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