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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51acf7df54ea6184330935c461ce453700e330dc9170fd3a4813ea4c0c32ec14' 
  AND token = 'Mjwxy9cUgHZuFsW4dlzJpb++O4B8TyCF9vKuISQwfx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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