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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '709d3230e74544b441306939d3aefec769e98979842e381a7993ea645e9842ea' 
  AND token = '1kMD+BRY2DuBWdflJ2J2iIzvdFY15+MyIl8dJ1+2xUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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