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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9e941a7a5dcbbf18dcc9f73aa5d1f07f2b9284077723a33c2fd5c8bf7850144' 
  AND token = 'b0xIAMmFMbiDQXbMpX4e1pHPBu9YdG6pzexuAEWv7jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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