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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd5ba9e3bdaf1e2c1ee61cbb11904499affac2ef76e6d59ce0795df791f3770a' 
  AND token = 'TJedkuKuXDTdHBcRKyWxB67Y/dJzJEjwBKemHc4NhcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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