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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '310b02afe1d5dfacec1adf9eb4ef8efdf68acf39b0d62eab16b9a06540232253' 
  AND token = 'LYwy9cGbIjrwQDKXPzx3Fo7E23popwznuteWesNPXHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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