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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fb2b1d400f0062fce9497487a46bb9a6a85a4da9e7abfa7e467f9bde3b5b1d1' 
  AND token = 'BZeYloxVrrSFxHO2Kh2E5rlV69qOjVGFu8AW47loSeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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