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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c2ca0b80f27d13e39f0bcff032f4270e662efa0d4fb2003e2a50845f62ddd9c' 
  AND token = 'CT8ShdUADETM4f/Q4pf9PT4/SJjwjjyeqbzRLCezpvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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