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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47fb0fe0bebd0bdd1b026e186a0f7da00d81cd12ed53e501741fe19e428bc593' 
  AND token = 'pFFaOCtPtvF5kEQ8uSgGZvt93FsZf3UpyqL0y8tLaXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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