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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0409de9154cecdbd75b1d5ca5654c5e8c643dc414106f19b9e41af35f88a7687' 
  AND token = 'dy/11PrAMGOsdFnqfRD9ieTl3EqzhX7kPCFN7weIMHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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